Whatever you're trying to do can be done with sub events. The initial event is what has to be true and then the OR conditions are individual sub events. i.e.
Y = true
---- X > 3 do this
---- X < 3 do this
This is saying if Y= true AND x > 3, do this event, OR if Y=true and X < 3, do the second event.
Or like I said above they can be individual events with bunched together conditions. If you're trying to do something specific and can't work out how then post what you're trying to do.